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Alignment Effect on the Piezoelectric Properties of Ultrathin Cellulose Nanofiber Films
ACS Applied Bio Materials ( IF 4.6 ) Pub Date : 2020-06-16 , DOI: 10.1021/acsabm.0c00364 Lindong Zhai 1 , Hyun Chan Kim 1 , Jung Woong Kim 1 , Jaehwan Kim 1
ACS Applied Bio Materials ( IF 4.6 ) Pub Date : 2020-06-16 , DOI: 10.1021/acsabm.0c00364 Lindong Zhai 1 , Hyun Chan Kim 1 , Jung Woong Kim 1 , Jaehwan Kim 1
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This study aims at evaluating the piezoelectric property of an ultrathin cellulose nanofiber (CNF) film in a thickness direction. Cellulose is known to have piezoelectric properties. However, its measurement is not easy. By making an ultrathin CNF film and eliminating space charges, the pure piezoelectric property of CNF is intended to be measured. A 600 nm thick ultrathin CNF film was prepared using a microfabrication process. The effect of alignment methods on the piezoelectric property of the ultrathin CNF film in the thickness direction was investigated with the three alignment methods: corona poling, electrical in-plane alignment, and high magnetic field (HiMA) alignment. Piezoresponse force microscopy (PFM) was utilized to analyze the piezoelectric property. By applying AC voltages using PFM, the vertical displacement on the ultrathin CNF film surface was recorded and converted into the piezoelectric coefficient, d33. The aligned ultrathin CNF films show different piezoelectric coefficients. The corona-poled ultrathin CNF film shows the largest piezoelectric coefficient among the three alignment methods. Water contact angle measurement proves that the piezoelectric constant in the thickness direction is associated with hydroxyl groups in cellulose chains appearing on the surface of the ultrathin CNF films.
中文翻译：
取向对超薄纤维素纳米纤维薄膜压电性能的影响
本研究旨在评估超薄纤维素纳米纤维 (CNF) 薄膜在厚度方向上的压电性能。已知纤维素具有压电特性。然而，它的测量并不容易。通过制作超薄 CNF 薄膜并消除空间电荷，旨在测量 CNF 的纯压电特性。使用微细加工工艺制备了 600 nm 厚的超薄 CNF 薄膜。采用电晕极化、电面内取向和高磁场(HiMA)取向三种取向方法研究了取向方法对超薄CNF薄膜厚度方向压电性能的影响。压电响应力显微镜（PFM）用于分析压电特性。通过使用 PFM 施加交流电压，33．_ 对齐的超薄 CNF 薄膜显示出不同的压电系数。电晕极化的超薄 CNF 薄膜在三种排列方法中显示出最大的压电系数。水接触角测量证明，厚度方向的压电常数与出现在超薄CNF薄膜表面的纤维素链中的羟基有关。
更新日期：2020-07-20
中文翻译：
取向对超薄纤维素纳米纤维薄膜压电性能的影响
本研究旨在评估超薄纤维素纳米纤维 (CNF) 薄膜在厚度方向上的压电性能。已知纤维素具有压电特性。然而，它的测量并不容易。通过制作超薄 CNF 薄膜并消除空间电荷，旨在测量 CNF 的纯压电特性。使用微细加工工艺制备了 600 nm 厚的超薄 CNF 薄膜。采用电晕极化、电面内取向和高磁场(HiMA)取向三种取向方法研究了取向方法对超薄CNF薄膜厚度方向压电性能的影响。压电响应力显微镜（PFM）用于分析压电特性。通过使用 PFM 施加交流电压，33．_ 对齐的超薄 CNF 薄膜显示出不同的压电系数。电晕极化的超薄 CNF 薄膜在三种排列方法中显示出最大的压电系数。水接触角测量证明，厚度方向的压电常数与出现在超薄CNF薄膜表面的纤维素链中的羟基有关。
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